Track Description"Swish Swish" is a song by American singer Katy Perry featuring American rapper Nicki Minaj. It was released on May 19, 2017, and serves as the third single for Perry's fifth studio album, Witness (2017). It is a house-inspired EDM song and samples "Star 69" by Fatboy Slim which in turn samples "I Get Deep" by Roland Clark and "What They Say" by Maya Jane Coles. Brazilian singer Gretchen stars in the "Swish Swish" lyric video. The official music video premiered August 24. "Swish Swish" is set to be featured in the upcoming dance video game Just Dance 2018, the dance choreography of which also appeared in the official music video.

"Swish Swish" was written by Perry, Minaj, Duke Dumont, Sarah Hudson and Starrah, and was produced by Dumont, Noah Passovoy and PJ Sledge. It is a house-inspired EDM song that samples "Star 69" by Fatboy Slim which in turn samples "I Get Deep" by Roland Clark. Raisa Bruner of Time called "Swish Swish" a hip hop song. The track runs for 4 minutes and 2 seconds. Perry said "Swish Swish" is a "great anthem for people to use when someone's trying to hold you down or bully you". The song is performed in the key of E♭ major with a tempo of 120 beats per minute in common time. The song follows a chord progression of Cm7–A♭maj7–Gm7–Cm7–A♭maj7–Fm7, and Perry's vocals span from E♭3 to A♭4.

A lyric video for the song was released on YouTube on July 3, and features Brazilian singer and reality television personality Gretchen. Two days later, Perry announced a contest titled the "#SwishSwishChallenge" for dancers to appear in the song's official music video where candidates submit videos of themselves dancing, and she would select her favorite dancer. After applicants posted their entries by the end of July 12, the video was filmed later in the month. A teaser for the official video was posted on August 21 on Perry's personal YouTube account.

The official music video for the single was directed by Dave Meyers and released on August 24, 2017. It includes appearances from Russell Horning, Gaten Matarazzo, Jenna Ushkowitz, Doug the Pug, Christine Sydelko, Rob Gronkowski, Molly Shannon, Hafþór Júlíus Björnsson, Karl-Anthony Towns, Rich Eisen, Bill Walton, and Terry Crews. Kia Stevens, Britney Young, Sydelle Noel, Ellen Wong, and Jackie Tohn make appearances as their characters from GLOW. In the video, Perry plays "Kobe Perry" the captain of the basketball team "The Tigers" whose opponents are known as "The Sheep", and Minaj performs during the game's halftime show. The video also features the brief reappearance of Kathy Beth Terry, Perry's character from "Last Friday Night (T.G.I.F.)", as well as a brief segment featuring the Bag Raiders song, "Shooting Stars". The National Stadium in Warsaw, Poland, was used for exterior views of the venue in the video.